<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .wrap{
      height: 200px;
    }
    .left{
      width: 200px;
      height: 100%;
      background-color: aqua;
      float: left;
    }
    .right{
      height: 100%;
      background-color: bisque;
      margin-left: 200px;
    }
  </style>
</head>
<body>
  <div class="wrap">
    <div class="left">left</div>
    <div class="right">right</div>
  </div>
</body>
</html>